st-line

Question: The point of intersection of the lines $\frac{x}{a}+\frac{y}{b}=1$ and $\frac{x}{b}+\frac{y}{a}=1$ lies on the line

1) $x-y=0$

2) $(x+y)(a+b)=2ab$

3) $(lx+my)(a+b)=(l+m)\ ab$

4) All of these

Solution:

Explanation: No Explanation

Slope of line Equation of line in different forms

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